Datasheet > LM3431-Q1

LM3431-Q1

更新时间： 2024-10-03 11:13:47

品牌	Logo	应用领域
德州仪器 - TI		驱动控制器驱动器
页数	文件大小	规格书
39页	1985K
描述
具有集成升压控制器的 3 通道汽车类 LED 恒流驱动器

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LM3431-Q1 数据手册

LM3431

www.ti.com

SNVS547G –NOVEMBER 2007–REVISED MAY 2013

3-Channel Constant Current LED Driver with Integrated Boost Controller

Check for Samples: LM3431

FEATURES

DESCRIPTION

The LM3431 is a 3-channel linear current controller

combined with a boost switching controller ideal for

driving LED backlight panels in space critical

applications. The LM3431 drives 3 external NPN

transistors or MOSFETs to deliver high accuracy

constant current to 3 LED strings. Output current is

adjustable to drive strings in excess of 200 mA. The

LM3431 can be expanded to drive as many as 6 LED

strings.

•

LM3431Q/LM3431AQ are Automotive Grade

Products that are AEC-Q100 Grade 1 Qualified

(–40°C to 125°C operating junction

temperature)

•

3-Channel Programmable LED Current

High Accuracy Linear Current Regulation

Analog and Digital PWM Dimming Control

Up to 25kHz Dimming Frequency

>100:1 Contrast Ratio

The boost controller drives an external NFET switch

for step-up regulation from input voltages between 5V

and 36V. The LM3431 features LED cathode

feedback to minimize regulator headroom and

optimize efficiency.

Integrated Boost Controller

5V-36V Input Voltage Range

Adjustable Switching Frequency up to 1MHz

LED Short and Open Protection

A DIM input pin controls LED brightness from analog

or digital control signals. Dimming frequencies up to

25 kHz are possible with a contrast ratio of 100:1.

Contrast ratios greater than 1000:1 are possible at

lower dimming frequencies.

Selectable Fault Shutdown or Automatic

Restart

•

Programmable Fault Delay

Programmable Cycle by Cycle Current Limit

Output Over Voltage Protection

No Audible Noise

The LM3431 eliminates audible noise problems by

maintaining constant output voltage regulation during

LED dimming. Additional features include LED short

and open protection, fault delay/error flag, cycle by

cycle current limit, and thermal shutdown for both the

IC and LED array. The enhanced LM3431A features

reduced offset voltage for higher accuracy LED

current.

Enable Pin

LED Over-Temperature Shutdown Input

Thermal Shutdown

TSSOP-28 Exposed Pad Package

APPLICATIONS

•

Automotive Infotainment Displays

Small to Medium Format Displays

TYPICAL APPLICATION CIRCUIT

Vin: 5V to 36V

VIN

VCC

MODE/F

DIM

LEDOFF

ILIM

PGND

THM

PWM Dim

input

LM3431

AFB

CFB

NDRV1

SNS1

NDRV2

SNS2

NDRV3

SNS3

REF

REFIN

COMP

VCC

SS/SH

DLY

SGND

Ch.2/

Ch.3

Ch.2

Ch.3

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...39

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与LM3431-Q1相关器件

型号	品牌	获取价格	描述	数据表
LM3431QMH	NSC	获取价格	3-Channel Constant Current LED Driver with Integrated Boost Controller
LM3431QMH/NOPB	TI	获取价格	具有集成升压控制器的 3 通道汽车类 LED 恒流驱动器 \| PWP \| 28 \| -40
LM3431QMHX	NSC	获取价格	3-Channel Constant Current LED Driver with Integrated Boost Controller
LM3431QMHX/NOPB	TI	获取价格	具有集成升压控制器的 3 通道汽车类 LED 恒流驱动器 \| PWP \| 28 \| -40
LM3432	NSC	获取价格	6-Channel Current Regulator for LED Backlight Application
LM3432	TI	获取价格	6-Channel Current Regulator for LED Backlight Application
LM3432B	NSC	获取价格	6-Channel Current Regulator for LED Backlight Application
LM3432BSQ	NSC	获取价格	6-Channel Current Regulator for LED Backlight Application
LM3432BSQE	NSC	获取价格	6-Channel Current Regulator for LED Backlight Application
LM3432BSQX	NSC	获取价格	6-Channel Current Regulator for LED Backlight Application

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